use the new correct config parameter

.config/alacritty/alacritty.yml

@@ -25,7 +25,7 @@ font:
 key_bindings:
   - { key: Return, mods: Control|Shift,  action: SpawnNewInstance }
 
-background_opacity: 0.85
+window.opacity: 0.85
 
 # Colors (Tomorrow Night Bright)
 colors:

.xonshrc

@@ -74,3 +74,11 @@ def plot(f, a:float=0.0, b:float=10.0, n:int=300):
     plt.plot(x, list(map(f, x)))
     plt.show()
 
+import hashlib
+
+def md5(val:str=None)->str:
+    if val is None:
+        val = input("Value: ")
+    val = val.encode()
+    return hashlib.md5(val).hexdigest()
+